ford f150 4x4 idle issues

Asked by max1955 Aug 10, 2014 at 03:22 PM about the 1992 Ford F-150 STD 4WD Extended Cab SB

Question type: Maintenance & Repair

I have very eratic idle issues than truck shuts off. I have replaced the idle and throttle sensors. also have good fuel pressure. don't know what the problem is?

2 Answers

60,425

would almost bet money your vacuum lines are brittle and leaking somewhere. I had an 88 5.0fi, i couldn't find any vacuum leaks. I took off the upper intake and redid every vacuum line I could and it fixed it

how do you locate the vacuum line that is bad? ive tried and replaced alot oif them, no help...some have no suction though, is this my problem?

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